ОХ256 Make a material and an electronic balance the fol

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Description

256. Make a material and an electronic balance the following redox reactions:
HNO3 + S  H2SO4 + NO;
HNO3 + As2S3 + H2O  H3AsO4 + H2SO4 + NO;
P + KOH + H2O → KH2PO4 + PH3;
H2SO3 + K2Cr2O7 + H2SO4  Cr2 (SO4) 3 + K2SO4 + H2O

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